Muffler.



R. S. STRAHAN.

MUFFLER.

APPLICATION nun PHIL, 1912 1,041,190. I 1 Patented 001.15, 1912.

WITNESSES. INVENTOR 1 X/A/M Jim;

outrun sra'rps PATENT OFFICE.

ROBERT SHELDON STRAHAN, OF BROOKLYN, NEW YORK.

MUFFLER.

ZLtldlJQU.

Specification of Letters Patent.

Patented Oct. 15,1912.

Application filed February 14, 1912. Serial No 677,508.

" a chamber containinga partial vacuum; and

second, to mufiie or deaden the sound of the;

exhaust from the engine. 1 attain these objects by the mechanism illustrated in the accompanying drawing, in whichlgligure 1 is a view of a motor boat showmg the mufiier attached to theend ofthe exhaust pipe of its engine; Fig, 2, is a vertical section of the mu'tlier and shows the relation of the open end of the mulller to the surface of the water; and Fig. 3, is a plan of the muiller.

Similar letters refer to..r. similar parts throughout the several views.

The motor boat A, its engine B, and the exhaust pipe E, the funneLshaped chamber- M, with its open end 0, slightly belowthe surface of the"watei w rthereby forming a muliier, constitute the features necessary to (Ionics of this patent may be obtained for effect an increase in the efficiency ofthe engineB, referred to hereinafter.

The exhaust pipe E, is held in place by the strap S, fastened to the side of the motor boat A. To the end of the exhaust pipe E, Fig. 2, is screwed the funnel shaped chamber M, framing the chamber C, and so placed that its open end O, is slightly below the surface of the water w, with the plane of the said open end t), parallel to the surface of the water 'LL.

It is readily seen. that when the motor boat-A, is in motion and the open end 0, oi the funnel shaped chamber M, passes across the surface of the water w, a partial vacuum is formed in the chamber C. It is the object oi? my invention to thus relieve the engine B, of exhausting against full atmospheric pressure by providing the chamber 0, at the end of the exhaust pipe E, as described, constituting the means of increasing the ciliciency of the engine B, pre viously referred to.

The causin of the exhaust gases of the engine B, to ischarge below the surface of the water w, by means of the funnel shaped chamber M, reduces the sound due to these gases to a minimum.

I am aware that the principle of passing a liquid rapidly across the open end of a chambercontaining a gas and thereby caus- "ing a partial vacuum to be formed in the said chamber is an old physical principle, but I am not aware that this principle has been applied to the exhaust pipe of a motor oat engine as herein specified. I am also aware that chambers placed at the end of exhaust pipes entirely below the surface of the water, and with their openends perpendicular'to the surface of the water, are used as mufllers, but I am notaware that a funnel shaped chamber placed entirely above the surface of the water with its open end parallel and adapted to come slightly below the surface of the water, hasbeen used as a mufller.

I claim: 1. .A funnel shaped chamber attached to the end of an exhaust pipe of a motor boat.

engine, the open end of the said chamber adapted to rest slightl below the surface of water whereby a partial vacuum is formed therein, substantially as set forth.

2. A,:Eu-nnel shaped chamber M, attached to the end of a motor boat engine exhaust pipe E, and adapted topass across the surface of water, and thereby form a mufiler,

"substantially as shown and for the purpose five cents each, by addressing the commissioner of Patents, Washington, D. C. 

